/otter/ - Otter Zone

Otters

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Otter species Anonymous 10/01/2019 (Tue) 15:51:25 No. 202
Hello /otter/,
The mustelid family is the most species-rich among all the carnivores. Of the subfamily Lutrinae, only 13 known species remain alive today.
There are also many lesser-known extinct species, such as Lutravus halli, Enhydritherium terraenovae, the genus Sivaonyx, etc.
I'd like to learn more about all of them to become a true otter connoisseur. Otters have a wide variety of species adapted to the different environments in which they live(d). So this thread is for sharing info and discussing about all the different otters that ever existed.
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I found an archived version of the /otter/ guide! It's got some basic info on the different species, though it's missing the pictures.
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Smooth-coated and Small-clawed otters can breed with each other, it has happened in Singapore. This is what their offspring look like.
>>203
Here is an archived version of that page with images: http://taiferret.sp-website.net/archive/otters/
The exceptional otter of Umbria Lutraeximia umbra, or "the exceptional otter of Umbria", is one of six pleistocene otter species found in Italy. It was identified by a single cranium and lived approximately 1.8 million years ago. Source (in Italian): https://www.lanazione.it/umbria/cronaca/lontra-pantalla-umbria-1.1706389
Enhydritherium terraenovae A large otter that existed from late Miocene to early Pleistocene. It could live in freshwater and marine coastal habitats, and its fossils were found in several places in Florida and California. Source: https://www.floridamuseum.ufl.edu/florida-vertebrate-fossils/species/enhydritherium-terraenovae >Otters, or members of the mustelid subfamily Lutrinae, fall into into two different groups based on the anatomy of their carnassial teeth, the upper fourth premolar (P4) and the lower first molar (m1). One group is called the “fish-eating” otters (Repenning, 1976; Lambert, 1997) and includes the extinct otter genus Satherium and the extant otter genera Lutra, Lontra, Pteronura, Amblonyx, and Aonyx. These otters are characterized by more blade-like carnassials, unlike the other group of otters, the bunodont otters. Bunodont otters possess non-blade-like carnassials with thick enamel and rounded cusps. The bunodont otters include the extant genus Enhydra (sea otters) as well as the extinct genera Enhydritherium and Enhydriodon (Lambert, 1997). >The genus Enhydritherium is thought to be closely related to the Enhydra and Enhydriodon, two genera found in late Miocene to early Pleistocene fossil sites of Europe, Asia, and Africa (Berta and Morgan, 1985; see Figure 2). This clade may be differentiated from all other members of the subfamily Lutrinae by the lack of the first premolar, a shorter rostrum, and bunodont cusps on the lower first molar (node 2, Figure 2). Enhydriodon is overall larger in size and is characterized by an “isolated” hypocone on the upper fourth premolar, which is different from Enhydritherium and Enhydra, which share several features including similar body size and the shapes of the upper fourth premolars and lower first molars (node 3, Figure 2). Enhydritherium may be distinguished from both Enhydriodon and Enhydra by the anterior and medial position of the protocone in the upper fourth premolar (Figure 3) and by the absence of the protostylid and presence of the metastylid on the lower first molar (Figure 4; Berta and Morgan, 1985; Lambert, 1997). Currently, Enhydritherium terraenovae is the only species in the genus. Tl;dr: There are two overall categories of otters, based on teeth structure. Enhydritherium is closely related to sea otters.
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>>923 Stay on topic pls. This is the paleo otter thread.
Cherin M. (2017) - New material of Lutra simplicidens (Carnivora, Mustelidae, Lutrinae), a key taxon for understanding the evolution of European otters.

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